fix(slider): add thumbLabels prop for multi-thumb accessibility

[greencookie-afk]

Summary

Add optional thumbLabels prop to the Slider component for accessible multi-thumb sliders.

Problem

Multi-thumb sliders (e.g., price range filters) have no way to distinguish thumbs for screen readers. This violates WAI-ARIA requirements.

Solution

• Added optional thumbLabels?: string[] prop
• Each thumb receives aria-label={thumbLabels?.[index]}
• Fully backward compatible

Usage

// Accessible range slider
<Slider defaultValue={[25, 75]} thumbLabels={["Minimum price", "Maximum price"]} />

// Regular slider - unchanged
<Slider defaultValue={[50]} />

Fixes #10221

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